Runestones

Runestones are protocol messages stored in Bitcoin transaction outputs

A Bitcoin UTXO transaction may constrain 1 runestone per transaction. Each Runestone may hold any number of Runes and Runes balances

A Runestone output's script pubkey begins with an OP_RETURN, followed by OP_13, followed by zero or more data pushes. These data pushes are concatenated and decoded into a sequence of 128-bit integers, and finally parsed into a runestone. https://docs.ordinals.com/runes.html

Runestones create and manage Runes by Etching, Minting and Transferring